Xinwei Sun

• Thøgersen, Annett; Sun, Xinwei; Jensen, Ingvild Julie Thue; Prytz, Øystein & Norby, Truls (2022). In-situ electron loss spectroscopy reveals surface dehydrogenation of hydrated ceria nanoparticles at elevated temperatures. Journal of Physics and Chemistry of Solids. ISSN 0022-3697. 170, p. 1–7. doi: 10.1016/j.jpcs.2022.110955.
• Sun, Xinwei; Gu, Jie; Han, Donglin & Norby, Truls (2022). Quantifiable models for surface protonic conductivity in porous oxides - case of monoclinic ZrO<inf>2</inf>. Physical Chemistry, Chemical Physics - PCCP. ISSN 1463-9076. 24(19), p. 11856–11871. doi: 10.1039/d1cp05668a.
• Kang, Xiaolan; Chatzitakis, Athanasios; Aarholt, Thomas; Sun, Xinwei; Negri, Chiara & Norby, Truls (2022). Facet-engineered TiO<inf>2</inf>nanomaterials reveal the role of water-oxide interactions in surface protonic conduction. Journal of Materials Chemistry A. ISSN 2050-7488. 10(1), p. 218–227. doi: 10.1039/d1ta06075a. Full text in Research Archive
• Sun, Xinwei; Xu, Kaiqi; Chatzitakis, Athanasios Eleftherios & Norby, Truls Eivind (2020). Photocatalytic generation of gas phase reactive oxygen species from adsorbed water: Remote action and electrochemical detection. Journal of Environmental Chemical Engineering. ISSN 2213-3437. doi: 10.1016/j.jece.2020.104809. Full text in Research Archive
• Sun, Xinwei; Simonsen, Stian Christopher; Norby, Truls Eivind & Chatzitakis, Athanasios Eleftherios (2019). Composite Membranes for High Temperature PEM Fuel Cells and Electrolysers: A Critical Review. Membranes. ISSN 2077-0375. 9(7). doi: 10.3390/membranes9070083.
• Sun, Xinwei; Xu, Kaiqi; Fleischer, Christian; Liu, Xin; Grandcolas, Mathieu & Strandbakke, Ragnar [Show all 9 contributors for this article] (2018). Earth-abundant electrocatalysts in proton exchange membrane electrolyzers. Catalysts. ISSN 2073-4344. 8:657(12), p. 1–41. doi: 10.3390/catal8120657. Full text in Research Archive Show summary

  In order to adopt water electrolyzers as a main hydrogen production system, it is critical to develop inexpensive and earth-abundant catalysts. Currently, both half-reactions in water splitting depend heavily on noble metal catalysts. This review discusses the proton exchange membrane (PEM) water electrolysis (WE) and the progress in replacing the noble-metal catalysts with earth-abundant ones. The efforts within this field for the discovery of efficient and stable earth-abundant catalysts (EACs) have increased exponentially the last few years. The development of EACs for the oxygen evolution reaction (OER) in acidic media is particularly important, as the only stable and efficient catalysts until now are noble-metal oxides, such as IrOx and RuOx. On the hydrogen evolution reaction (HER) side, there is significant progress on EACs under acidic conditions, but there are very few reports of these EACs employed in full PEM WE cells. These two main issues are reviewed, and we conclude with prospects for innovation in EACs for the OER in acidic environments, as well as with a critical assessment of the few full PEM WE cells assembled with EACs.

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• Sun, Xinwei; Vøllestad, Einar & Norby, Truls (2022). Surface protonic conductivity in chemisorbed and physisorbed water layers in porous nanoscopic CeO2 .
• Sun, Xinwei; Vøllestad, Einar & Norby, Truls (2022). Surface protonics - a tutorial.
• Sun, Xinwei & Norby, Truls (2021). Surface protonic conductivity in chemisorbed and physisorbed water layers in porous nanoscopic CeO2.
• Norby, Truls; Kang, Xiaolan; Sun, Xinwei; Vøllestad, Einar; Gu, Jie & Han, Donglin (2021). Surface Protonics of Porous Oxide Ceramics.
• Norby, Truls; Sun, Xinwei; Kang, Xiaolan; Vøllestad, Einar; Gu, Jie & Han, Donglin (2021). Surface Protonics of Porous Oxide Ceramics .
• Norby, Truls Eivind & Sun, Xinwei (2020). Protonic conduction in water and hydrogen adsorbed in porous materials.
• Norby, Truls Eivind & Sun, Xinwei (2019). Hydrogen and clean air - Norway and China.
• Norby, Truls Eivind & Sun, Xinwei (2019). Novel UiO Technologies for Green Energy and Clean Air in China.
• Sun, Xinwei & Norby, Truls Eivind (2019). Hydrogen og hydrogenteknologi.
• Sun, Xinwei; Chatzitakis, Athanasios Eleftherios & Norby, Truls Eivind (2019). Composite membranes for high temperature PEM fuel cells and electrolysers. Show summary

  Polymer electrolyte membrane(PEM) fuel cells and electrolysers offer efficient use and production of H2 for emission-free transport and sustainable energy systems. In order to reduce the cost,complexity,flooding,catalyst poisoning and degradation,operation above 80°C and at lower relative humidities(RH) is preferable. Acid doped polybenzimidazole(PBI),sulfonated polyetheretherketone(SPEEK) and their composites are being investigated for high temperature and low RH operation with sufficient conductivities. We take a critical view and a surface protonic approach to gain fundamental insight.

• Sun, Xinwei; Chatzitakis, Athanasios Eleftherios & Norby, Truls Eivind (2019). Polymer-ceramic composite membranes for intermediate temperature PEM fuel cells.
• Sun, Xinwei; Xu, Kaiqi; Chatzitakis, Athanasios Eleftherios & Norby, Truls Eivind (2018). Can hydroxyl radicals travel far? Gas phase transport and detection after photocatalytic generation at TiO2 nanorods.

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